Author/Authors :
Visagamani Arularasu, Markasagayam PG and Research Department of Chemistry, Presidency College (Autonomous), Chennai, Tamil Nadu, India , Sundaram, Rangasamy PG and Research Department of Chemistry, Presidency College (Autonomous), Chennai, Tamil Nadu, India , Magdalane, Chinnapan Maria Department of Chemistry, St. Xavier’s College (Autonomous), Tirunelveli, India , Kanimozhi, Kasinathan PG Research & Department of Chemistry, Auxilium College (Autonomous), Vellore, India , Kaviyarasu, Kasinathan UNESCO-UNISA Africa Chair in Nanoscience’s/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, Pretoria, South Africa , Thema, Force Tefo UNESCO-UNISA Africa Chair in Nanoscience’s/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, Pretoria, South Africa , Letsholathebe, Douglas Department of Physics, University of Botswana, Private Bag 0022, Gaborone, Botswana , Mola, Genene Tessema School of Chemistry and Physics, University of Kwazulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg, South Africa. , Maaza, Malik UNESCO-UNISA Africa Chair in Nanoscience’s/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, Pretoria, South Africa
Abstract :
A humidity sensor thin film based on nanoporous PbWO4-WO3 composites has been prepared by spin coating technique with different weight ratio of PbWO4 (Pb) and WO3 (WO) (PWWO-01, PWWO-82, PWWO-64, PWWO-46, PWWO-28, PWWO-01) and their humidity sensing properties have also been investigated at different relative humidity (RH) in the range of 5% - 98% at room temperature with dc resistance. It is found that composite PWWO-28 show best humidity sensing properties with the sensitivity factor value of (Sf) 3733. The response and recovery time of humidity sensor are about 50 s and 120 s, respectively. High sensitivity, narrow hysteresis loop, rapid response and recovery, prominent stability and good repeatability are obtained. Synthesized PbWO4-WO3 composites were characterized by power X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, BET and photoluminescence studies. The photocatalytic result demonstrated photocatalytic efficiency of nonporous PWWO-28 composite. The antimicrobial activity of the composites was determined by disc diffusion method.
